GEAR RATIO GUIDE FOR LARGER TIRES
Whenever you change tire size from the original size or from one size to another, this will have a direct effect on power and driveability. The chart below will help you to select the optimum gear ratio to bring the power and torque back to where you want them. Using the chart, first determine what your original gear ratio and tire size are, then follow the lines to find your approximate RPM at 65 MPH. Next find the new tire size on the left of the chart and look across to find the RPM closest to your original, the ratio listed at the top of that column will be your first choice for ratio. If you are interested in a change that will give more power or better mileage use the shaded coding as a guide.
RECOMMENDED GEAR RATIO